A Metro spokeswoman said the agency’s plant maintenance department is investigating what caused water to flow into Farragut North station’s mezzanine. She said water service has been shut off.

D.C. Water public information officers said the leak came from a rooftop chiller tower owned by Metro. Earlier Tuesday, a Metro spokesman had said the morning leak was caused by a broken water main, but D.C. Water officials said workers found no leaks within the District’s water system.

Updated post at 9:42 a.m.

Metro said Farragut North station’s Connecticut Avenue entrance has reopened.

Original post at 6:57 a.m.

The Connecticut Avenue entrance at Farragut North station on the Metro’s Red Line was closed Tuesday morning following a water main break.

The entrance was closed when the system opened at 5 a.m., a Metro spokesman said.

Spokesman Dan Stessel the impact is minor and trains are not affected. He said two other Farragut North entrances — on L and K streets NW — are open.

He said Metro authorities are not sure how long it will take D.C. Water to make repairs.